Ezekiel 24:11

Then set it empty upon the coals thereof, that the brass of it may be hot, and may burn, and [that] the filthiness of it may be molten in it, [that] the scum of it may be consumed.

Ver. 11. That the brass of it may be hot, and may burn.] This Gregory a fitly applieth to Rome, taken and wasted by the Lombards. This city, ever since it was Papal - and then it first began to be so - was never besieged, but it was taken by the enemy.

a Iam vacua ardet Roma: iam enim et ipsa olla consumitur, in qua prius carnes et ossa consumebantur. - Hom. 18 in Ezek.